netdev - Re: [PATCH net-next v5 07/15] virtio_net: virtnet_build_xdp_buff

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Date: Mon, 8 May 2023 14:46:01 +0800
From: Jason Wang <jasowang@...hat.com>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: netdev@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, 
	John Fastabend <john.fastabend@...il.com>, virtualization@...ts.linux-foundation.org, 
	bpf@...r.kernel.org
Subject: Re: [PATCH net-next v5 07/15] virtio_net: virtnet_build_xdp_buff_mrg()
 auto release xdp shinfo

On Mon, May 8, 2023 at 2:14 PM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
>
> virtnet_build_xdp_buff_mrg() auto release xdp shinfo then the caller no
> need to careful the xdp shinfo.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>

Acked-by: Jason Wang <jasowang@...hat.com>

Thanks

> ---
>  drivers/net/virtio_net.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index b26e95c96141..2d1329c32751 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1194,7 +1194,7 @@ static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
>                                  dev->name, *num_buf,
>                                  virtio16_to_cpu(vi->vdev, hdr->num_buffers));
>                         dev->stats.rx_length_errors++;
> -                       return -EINVAL;
> +                       goto err;
>                 }
>
>                 stats->bytes += len;
> @@ -1213,7 +1213,7 @@ static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
>                         pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
>                                  dev->name, len, (unsigned long)(truesize - room));
>                         dev->stats.rx_length_errors++;
> -                       return -EINVAL;
> +                       goto err;
>                 }
>
>                 frag = &shinfo->frags[shinfo->nr_frags++];
> @@ -1228,6 +1228,10 @@ static int virtnet_build_xdp_buff_mrg(struct net_device *dev,
>
>         *xdp_frags_truesize = xdp_frags_truesz;
>         return 0;
> +
> +err:
> +       put_xdp_frags(xdp);
> +       return -EINVAL;
>  }
>
>  static void *mergeable_xdp_get_buf(struct virtnet_info *vi,
> @@ -1357,7 +1361,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
>                 err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz,
>                                                  &num_buf, &xdp_frags_truesz, stats);
>                 if (unlikely(err))
> -                       goto err_xdp_frags;
> +                       goto err_xdp;
>
>                 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats);
>
> --
> 2.32.0.3.g01195cf9f
>